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In short, Xerox invented the granddaddy of personal computers, and invented for it the graphical user interface, laser printer, computer-generated bit map, etc.
However, Xerox didn't care about it much as the research scientists tried, and so the research scientists let in anyone who wanted to see it. Two of the people who saw it were Bill Gates and Steve Jobs.
Xerox, in short, invented the information age, and then gave it away.